<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .container {
        display: grid;height: 500px;
        grid-template-columns: repeat(3, 200px);
        grid-template-rows: repeat(3, 1fr);
        grid-auto-flow: column;
        gap: 10px;
        overflow: auto;
        grid-auto-columns: 100px;
        grid-template-areas: "a b" "a b";
      }
      .a{
        grid-area: a;
      }
      .b{
        grid-area: b;
      }
      .item {
        background-color: rgb(255, 139, 43);
        box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.2),
          -0px -0px 10px rgba(223, 139, 15, 0.877) inset;
        border-radius: 10px;
        padding: 10px 0;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="item a ">1</div>
      <div class="item b">2</div>
      <div class="item">3</div>
      <div class="item">4</div>
      <div class="item">5</div>
      <div class="item">6</div>
      <div class="item">7</div>
      <div class="item">8</div>
      <div class="item">9</div>
      <div class="item">10</div>
      <div class="item">11</div>
      <div class="item">12</div>
      <div class="item">13</div>
      <div class="item">14</div>
      <div class="item">15</div>

      <div class="item">16</div>
      <div class="item">17</div>
      <div class="item">18</div>
      <div class="item">19</div>
      <div class="item">20</div>
      <div class="item">21</div>
      <div class="item">22</div>

      <div class="item">23</div>
      <div class="item">24</div>
      <div class="item">25</div>
      <div class="item">26</div>
      <div class="item">27</div>
      <div class="item">28</div>
      <div class="item">uniapp</div>
      <div class="item">30</div>
      <div class="item">31</div>
      <div class="item">32</div>
      <div class="item">33</div>
      <div class="item">34</div>
      <div class="item">35</div>
      <div class="item">36</div>
    </div>
  </body>
</html>
